What causes excessively low pressure difference in my Hitachi Air Conditioner?
Excessively low pressure difference in your Hitachi Air Conditioner is caused when the pressure ratio calculated from high pressure (Pd) and low pressure (Ps) is lower than 1.8 MPa during 3 minutes.
Why does my Hitachi RAS-4HRNME-AF Air Conditioner show a power phase detection abnormality?
A power phase detection abnormality in Hitachi Air Conditioner indoor units can be caused by an open phase in the power source wiring.
What causes suction pressure decrease prevention to activate in my Hitachi RAS-4HRNME-AF Air Conditioner?
Activation of suction pressure decrease prevention in your Hitachi Air Conditioner can be caused by a shortage or leakage of refrigerant, piping clogging, a close-locked expansion valve, or a locked fan motor.
What causes indoor unit number setting error in my Hitachi RAS-4HRNME-AF?
Indoor unit number setting error in your Hitachi Air Conditioner can be caused if indoor units with the same number exist in a refrigerant piping system.
What causes outdoor temperature thermistor abnormality in my Hitachi RAS-4HRNME-AF?
An outdoor temperature thermistor abnormality in your Hitachi Air Conditioner can be caused by a loose, disconnected, broken or short-circuited connector.
What causes abnormal transmission between Inverter PCB and Main PCB in my Hitachi Air Conditioner?
Abnormal transmission between Inverter PCB and Main PCB in your Hitachi Air Conditioner is caused if the communication between Main PCB (PCB1) and Inverter (DIP - IPM/ISPM) is not performed correctly during 30 seconds.
What causes Opentherm communication failure in my Hitachi RAS-4HRNME-AF?
Opentherm communication failure in your Hitachi Air Conditioner is caused if there is no Opentherm communication for a continuous period of 1 minute.
What causes RF communication failure in my Hitachi RAS-4HRNME-AF Air Conditioner?
RF communication failure in your Hitachi Air Conditioner happens when there is no communication for 1 hour with one or two RF receivers which are bound to the RF-Bridge.
What causes water DHWT thermistor abnormally (THM D-HWT) in my Hitachi RAS-4HRNME-AF Air Conditioner?
A water DHWT thermistor abnormality in your Hitachi Air Conditioner can be caused by a loose, disconnected, broken or short-circuited connector.
What causes inverter fin temperature abnormality in my Hitachi RAS-4HRNME-AF?
An inverter fin temperature abnormality in your Hitachi Air Conditioner can be caused by a fin thermistor abnormality, heat exchanger clogging, or fan motor abnormality.
General| Brand | Hitachi |
|---|---|
| Model | RAS-4HRNME-AF |
| Category | Air Conditioner |
| Language | English |
Key notices regarding compatibility, specifications, and manual usage.
Explains the heat pump's function, energy efficiency, and features.
Outlines power supply requirements, shutdown procedures, and handling of snow/ice.
Explains functions like 3-minute guard, frost prevention, auto-restart, and defrost cycles.
Guides users on identifying and resolving common operational faults and abnormal sounds.
Lists and illustrates the various components of the outdoor unit.
Shows the flow of refrigerant for cooling and heating, with component identification.
Covers transport, placement, ventilation, and protection from environmental factors.
Details required clearances for single and multiple outdoor unit installations.
Specifies requirements for concrete foundations, anchor bolts, and drainage.
Specifies copper pipe requirements, cleaning, and insulation for piping.
Details how to suspend piping and connect it to outdoor units, including pipe routing.
Covers design charts for piping length, height difference, and pipe size selection.
Outlines the process for charging refrigerant, performing vacuum tests, and pump-down.
Explains the use and connection of the drain boss for water discharge.
Covers checks for electrical data compliance, voltage, impedance, and grounding.
Details wiring connections for outdoor units and the function of DIP switches.
Provides guidelines for wiring between indoor/outdoor units and compliance with local codes.
Specifies recommended minimum wire sizes for power, transmitting, and actuator cables.
Covers checks for unit appearance, installation, electrical connections, and refrigerant circuit.
Guides users through executing and monitoring the test run using the remote control.
Details test run setup via outdoor unit DIP switches for various operational modes.
Explains protection settings for compressor high pressure and fan motor temperature.
Provides a table of alarm codes, origins, details of abnormalities, and main factors.
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